Okuma Vac 2 drive error


Results 1 to 10 of 10

Thread: Okuma Vac 2 drive error

  1. #1
    Member
    Join Date
    Apr 2008
    Location
    Netherlands
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Okuma Vac 2 drive error

    I have a machine with 2 Okuma VAC2 11 kw spindle drives 1993 Okuma LT15.
    One of them gets a power loss red led while the green power led is on.
    Only the red and the green led is on while all other leds are off and there is
    no alarm nummer shown. The led display is also off.
    I seems to be the 5 volt that is 1 volt.
    It is temperature dependent. If I start the machine on in the morning it
    gets this erros after 5 minutes.
    But when I restart the machine the same error repeats in 1 minut.
    If I let it cool down it takes 5 minutes again before the error pops up again.

    The error we get on the display is
    78 error P VAC start spindle 2 1001FFFF


    We could exchange some components on the print but I don't
    know where to start and wonder if this is a known issue with
    these old drives.

    Does anybody know which components could be suspected?
    I could post a picture of the print.

    Thanks

    Similar Threads:


  2. #2
    Registered
    Join Date
    Jan 2010
    Location
    austria
    Posts
    56
    Downloads
    0
    Uploads
    0

    Default

    Hi Richard,

    Try checking the top pcb Board of the Vac Spindle drive, and see if any capacitor is either Blown on the top, or has loose legs. With a bright light maybe you can check if there is leakage of any capacitor fluid. Typically time related components that fail after a while when the pcb gets a little bit warm are usually cap related problems (my experience)
    Maybe you are lucky and can change the caps and the board will work, any good skilled electrician can also do this. Please keep in mind there are some bidirectional caps there, not common ones, please replace them with exactly the dame components.
    Try it, and if it doesnt solve the problem my best recommendation is to send the top board for repair, If the drive is old, send the complete unit in for a complete overhaul. Trust me in the long run maybe this is the best solution. But don't keep forcing the machine turning it on or off hoping for the problem to go away, because if there is a failing cap, and it starts to leak, it can damage more components. By the way? where are you from? Maybe I can recommend you someone who repaired my board.
    regards..




    Quote Originally Posted by richardfp4 View Post
    I have a machine with 2 Okuma VAC2 11 kw spindle drives 1993 Okuma LT15.
    One of them gets a power loss red led while the green power led is on.
    Only the red and the green led is on while all other leds are off and there is
    no alarm nummer shown. The led display is also off.
    I seems to be the 5 volt that is 1 volt.
    It is temperature dependent. If I start the machine on in the morning it
    gets this erros after 5 minutes.
    But when I restart the machine the same error repeats in 1 minut.
    If I let it cool down it takes 5 minutes again before the error pops up again.

    The error we get on the display is
    78 error P VAC start spindle 2 1001FFFF


    We could exchange some components on the print but I don't
    know where to start and wonder if this is a known issue with
    these old drives.

    Does anybody know which components could be suspected?
    I could post a picture of the print.

    Thanks




  3. #3
    Registered richardaut's Avatar
    Join Date
    Oct 2005
    Posts
    3
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    Hi

    I am in the Netherlands. I see you are in Austria?
    I really like to know who repaired your board.

    Thanks
    Richard



  4. #4
    Registered
    Join Date
    Jan 2010
    Location
    austria
    Posts
    56
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    Hi Richard,

    Im currently living in South America, no longer in Austria.
    I´ve worked several times with Pat from Hytech Automation Repair, you can look him up in google.
    He repaired a Spindle Drive, and an X-axis drive from my Okuma.
    regards,
    Alberto



    Quote Originally Posted by richardaut View Post
    Hi

    I am in the Netherlands. I see you are in Austria?
    I really like to know who repaired your board.

    Thanks
    Richard




  5. #5
    Member
    Join Date
    Apr 2008
    Location
    Netherlands
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    If the Vac drive is not in the power loss mode then we
    can start the machine normally and we get

    1136 vac coil error a for both spindle 1 and 2

    We already cleaned the white relais under the Vac drives
    including the helper contacts and also the relais under the
    controll PCB of the Vac drive.

    The manual says
    Probable faulty locations: Windows change over MS
    Replace the winding change over MS or Replace relay panel.

    I understand the problem has something to do with M41 and M42
    windings changeover.
    It seems like the CNC gives a signal to go in either M41 or M42
    and it does not give a signal back.

    Does anybody know what MS means?
    Does anybody know if there are more relais that we should check?

    Thanks
    Richard



  6. #6
    Registered
    Join Date
    Jan 2010
    Location
    austria
    Posts
    56
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    Hi,
    I´m not too sure about this alarm, but I am sure about one thing.
    I have had problems in the past with some machines, That if the underlying issue is not solved, then other errors alarms can come up.
    My recommendation would be, solve the issue with the Top pcb first, the pcb itself may already not be working ok, and the top pcb is the one controlling the Vac drive.
    So maybe a signal is not getting somewhere it should be getting to, because the pcb itself is not ok.
    Maybe someone has another idea.
    regards,



    Quote Originally Posted by richardfp4 View Post
    If the Vac drive is not in the power loss mode then we
    can start the machine normally and we get

    1136 vac coil error a for both spindle 1 and 2

    We already cleaned the white relais under the Vac drives
    including the helper contacts and also the relais under the
    controll PCB of the Vac drive.

    The manual says
    Probable faulty locations: Windows change over MS
    Replace the winding change over MS or Replace relay panel.

    I understand the problem has something to do with M41 and M42
    windings changeover.
    It seems like the CNC gives a signal to go in either M41 or M42
    and it does not give a signal back.

    Does anybody know what MS means?
    Does anybody know if there are more relais that we should check?

    Thanks
    Richard




  7. #7
    Member
    Join Date
    Apr 2008
    Location
    Netherlands
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    I will have the top PCB repaired in the next weeks and will report
    what happened.

    Thanks
    Richard



  8. #8
    Registered
    Join Date
    Jan 2010
    Location
    austria
    Posts
    56
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    Ok, thanks, and please let us know when you are able to solve the problem, Good Luck!

    regards,
    Alberto


    Quote Originally Posted by richardfp4 View Post
    I will have the top PCB repaired in the next weeks and will report
    what happened.

    Thanks
    Richard




  9. #9
    Member
    Join Date
    Apr 2008
    Location
    Netherlands
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    We did have the VAC2 drive 5 volt repaired which showed 0 volt.
    That fixed the problem
    Thanks



  10. #10
    Registered
    Join Date
    Feb 2018
    Posts
    1
    Downloads
    0
    Uploads
    0

    Default Re: Okuma Vac 2 drive error

    Quote Originally Posted by richardfp4 View Post
    I have a machine with 2 Okuma VAC2 11 kw spindle drives 1993 Okuma LT15.
    One of them gets a power loss red led while the green power led is on.
    Only the red and the green led is on while all other leds are off and there is
    no alarm nummer shown. The led display is also off.
    I seems to be the 5 volt that is 1 volt.
    It is temperature dependent. If I start the machine on in the morning it
    gets this erros after 5 minutes.
    But when I restart the machine the same error repeats in 1 minut.
    If I let it cool down it takes 5 minutes again before the error pops up again.

    The error we get on the display is
    78 error P VAC start spindle 2 1001FFFF


    We could exchange some components on the print but I don't
    know where to start and wonder if this is a known issue with
    these old drives.

    Does anybody know which components could be suspected?
    I could post a picture of the print.

    Thanks
    I know we have had a lot of success using TIE Repair for our Okuma drives. They do a free repair eval which has been a great place to start. Hope your issue gets resolved!



Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Okuma Vac 2 drive error

Okuma Vac 2 drive error